\begin{tabular}{|c|c|} \hline Week & Sales(3,000sofgallons) \\ \hline 1 & 17 \\ \hline 2 & 22 \\ \hline 3 & 19 \\ \hline 4 & 24 \\ \hline 5 & 18 \\ \hline 6 & 17 \\ \hline 7 & 20 \\ \hline 15 & 10 \\ \hline 9 & 22 \\ \hline 10 & 21 \\ \hline 11 & 16 \\ \hline 12 & 22 \\ \hline \end{tabular} (a) Computa four-weck snd five-week moving averages foe the time series: (b) Compute the dtst for the four woek meming average forecasts fiound your antwer to foy secimik places ) Cumisile the MSt for the five weke moving awerage forecasts. (Round your anwer to fwo gicimal plsaes ). Thred wecks appecers to be bost, becaube-1se three-woek moving aver Mge provites the smallet ast. Thret aeeks appesars to be test, because the tis ee woek evoving average gruvides the lar gert Mst Four weeks bupears to be best, berauee the fohir-wwek rocving average provides the smalect MGE Twe meeks apposis to te bert, because the five neek movang average provides the sundiat M5i. None appear botter tian the athers; bocause they ail provide the same Mat